Vac issues

[4doorciv]

Well if you remember from my last topic I for the truck to idle. Well had some tinker time with it and installed a boost/vac gauge. The truck idles with the biss screw almost all the way out and has only 6 inhg. I'm going to go to my old college and have them put their smoke machine to it since no external leaks visable.

[4doorciv]

Oh and for the modified intake manifold, why does the egr runner go into the head? Pros and cons of caping in a state without emissions. My issues might be related to the modification.

[4doorciv]

Egr runner goes back into the head to collect the exhaust gases. Used a gasket on the block off plate and didn't help. Got a compression tester and a small air compressor. Would it work if I pressurise a cyl on the intKe stroke to fill the intake manifold and listen for hissing. Thinking only 15 psi max.